No matter how good you are, how much experience you have, there is always something more to learn.
I have known writers who say they won’t attend another workshop or listen to a speaker or take another class because they’ve “been there, done that.”
While that is understandable in some cases, it’s always good to keep up with what’s new in the industry.
Beyond that, by being open to learning and to new experiences, we might pick up something new or be reminded of something we learned some time ago.
As one becomes a more experienced writer, one can be choosier and make wiser choices of who to see or what to attend – but we should all carry the idea to never stop learning.